Content Development

 
 
 
 
  EXCELLENT  
  
 Based on 42 reviews 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 Posted on Google  
 
  
 
 
 Ciaran Gallagher 
 
October 7, 2026
 
 
  
Jonathon recently delivered in-person telesales training for our team at Kelsius, and we were very impressed with the overall experience. His industry knowledge and experience were particularly valuable, allowing him to bring practical, real-world insight to the training rather than relying solely on theory.

His attention to detail and the effort he put into understanding our business ensured the training was relevant and tailored to our team. The sessions were engaging and practical, with plenty of useful takeaways that could be applied immediately. We have also been very impressed with the aftercare and follow-up support since the training.

I’d have no hesitation in recommending Jonathon to any business looking to develop its sales team.
  
 
 
 
 
 
 Posted on Google  
 
  
 
 
 Bojan Ambrus 
 
September 17, 2026
 
 
  
GSA Marketing has been a fantastic telesales partner for Nexus Media Group, helping us drive event awareness and registration. We provided the data, scripts, and audience insights, and their team ran with it seamlessly — communicating clearly at every stage and feeding information back so we always felt in the loop. They genuinely became an extension of our own marketing team.

Special thanks to Monica and Yukta, who went above and beyond to make sure our audience had a great experience throughout. Highly recommend GSA for anyone looking for a telesales agency that treats your event like their own.
  
 
 
 
 
 
 Posted on Google  
 
  
 
 
 David Richardson 
 
August 26, 2026
 
 
  
We asked GSA to run a research campaign into a specialist and quite technical market, with a fairly hard-to-reach audience, so it was never going to be a quick win. What stood out was the tenacity of the team — Monica kept us updated so we always knew where things stood, and Temara kept working the outreach rather than settling for the easy answers.

The outcome was a genuinely valuable set of data, along with several real opportunities we're now following up. The reporting was clear, and they were happy to cut the findings a different way or set up follow-up conversations where we wanted to dig deeper.

A pleasure to work with, and I'd happily recommend them.
  
 
 
 
 
 
 Posted on Google  
 
  
 
 
 Stuart 
 
July 15, 2026
 
 
  
As a sales leader, I have worked with many trainers over the years, and what sets Jonathan apart is his thoroughness in getting to know our specific business before setting out the training programme.

Jonathan invested significant time learning our market, sales motion, customer conversations, and objectives before designing a tailored programme for our Inside Sales team. Rather than delivering generic telesales training, he built a curriculum aligned to the realities of our business and the challenges our team faces every day. A genuine commitment to understanding our organisation was demonstrated to ensure that the training was relevant, practical, and immediately applicable.

His approach combined engaging classroom sessions with detailed one-to-one call coaching. The call reviews were particularly impactful, focusing not just on what our team was saying, but how they were saying it. He helped improve consistency across the team, strengthen rapport-building skills, sharpen discovery conversations, improve handoffs, establish clear next steps, and create more natural customer interactions that avoided sounding scripted.

Jonathan also introduced practical frameworks for handling gatekeepers, improving call structure, and increasing the effectiveness of outbound prospecting activities. Most importantly, he reinforced the discipline and consistency required to build a scalable inside sales organisation.

His coaching style is engaging, insightful, and highly practical. Team members received actionable feedback they could immediately apply, resulting in greater confidence, improved call quality, and a more professional and effective outbound sales approach.

I would strongly recommend Jonathan and the team at GSA to any revenue leader looking to improve the performance of their SDR, BDR, Inside Sales organisation (or, frankly, any team dealing with customers). Their ability to combine sales methodology, coaching, and real-world application delivers measurable value for both individuals and the business.  A personal thanks for a thoroughly engaging and enjoyable programme!
  
 
 
 
 
 
 Posted on Google  
 
  
 
 
 Jo Millett 
 
May 18, 2026
 
 
  
We used GSA for an event we had in London. They handled lead generation and telemarketing for the event. They were very thorough and touched base with us every step of the way to make sure the campaign was successful. They are professional and prompt and kept us up to date with the campaign and the milestones as we progressed closer to the event. I highly recommend if you need a telemarketing & B2B lead generation services you should reach out to GSA and talk to Jonathan and Monica